USSD problems with MTK 0828

Have the same problem on VS-GGU-E2M0400.
There is a solution?

There is no solution ?

You'll excuse me but announced that this functionality works
After buying your equipment is working through that again.
Out that your product does not match the description, if the problem can not be solved correct description of the equipment so that people know what works and what does not

Here is a manual to fix it:
www.openvox.cn/pub/firmwares/GSM%20Gatew...%20Flash%20Guide.pdf